What this guide covers
- What tiered entry means
- The core tier explained
- The extended tier explained
- Which subjects are tiered
- How to choose the right tier
- Frequently asked questions
What tiered entry means
Not every IGCSE subject offers a single set of papers for all candidates. In a number of subjects, entry is tiered, which means a candidate is entered for one of two routes through the assessment: the core tier or the extended tier. Both lead to the same IGCSE in that subject, but they differ in the difficulty of the papers sat and, crucially, in the range of grades that can be awarded. The tier is chosen before the examinations, usually by the school in consultation with the teacher and the family, and it reflects a judgement about the level at which a student is working. Tiering exists so that assessment can be pitched appropriately, allowing confident students to be challenged and stretched while giving others a fair route to a solid grade without facing questions well beyond their level.
The core tier explained
The core tier is built around the foundational content of a subject. Its papers concentrate on the essential knowledge and skills that every candidate should master, and they are designed to be accessible to students working at a middle level. The trade off for that accessibility is a ceiling on the grade available. On the lettered scale, the core tier typically leads to grades from C down to G, and on the numeric scale to broadly grade 5 down to grade 1. A candidate who performs superbly on core papers still cannot reach the very top grades, because those are not offered on this tier. For a student whose strength in a subject is genuine but not exceptional, core can be the sensible route to a secure and respectable grade, sat with confidence rather than anxiety.
The extended tier explained
The extended tier covers the core content and adds more demanding material on top. Its papers include harder questions and a wider range of content, and in return they open access to the highest grades. On the lettered scale the extended tier reaches from A star down to E, and on the numeric scale from grade 9 down to around grade 2. Because the ceiling is the top of the scale, any student aiming for an A star, an A or a grade 9 must be entered for extended, since those grades simply are not available through core. The extended tier suits students who are comfortable with the more challenging material and who are targeting the upper grades, whether for their own standards or for the entry requirements of a competitive sixth form or course.
The top grades live on the extended tier
The single rule to remember is that core caps the grade below the top of the scale. A student with ambitions for the highest grades must sit extended. For how those top grades themselves are structured, see our guide to IGCSE nine to one grading and the British curriculum hub.
Which subjects are tiered
Tiered entry is most common in subjects where content difficulty scales sharply, such as mathematics and the sciences, and in some language and other subjects depending on the board and syllabus. It is important to understand that tiering is not universal. Many IGCSE subjects are untiered, meaning all candidates sit the same papers and the full grade range is available to everyone. Because practice varies between Cambridge and Edexcel and between syllabuses, families should check the specification for each subject rather than assume that a subject is or is not tiered. Where a subject is tiered, the school will normally indicate which tier it intends to enter a student for, and that decision can often be reviewed as a course progresses and a clearer picture of the student's level emerges.
How to choose the right tier
Choosing a tier is a judgement about a student's secure level of achievement in that specific subject, made with the teacher who sees their work week to week. The guiding question is whether the student can handle the extended content well enough to benefit from access to the top grades, or whether the demands of extended risk pulling down a grade that would be secure at core. A capable student aiming high should generally take extended, since only that tier keeps the best grades in reach. A student who finds the harder material a genuine struggle may achieve a stronger, more confident result at core than a shaky one at extended. Decisions are best made per subject rather than across the board, because a student can sit extended in a subject of strength and core in one they find harder. Keep the decision under review, take the teacher's advice seriously, and match the tier to the student rather than to ambition alone.
Frequently asked questions
What is the difference between IGCSE core and extended?
Core and extended are two tiers of entry in some IGCSE subjects. Core papers cover the foundational content and lead to the middle and lower grades, while extended papers add more demanding material and give access to the top grades.
What grades can you get on IGCSE core papers?
On the lettered scale, core papers typically lead to grades from C down to G, while extended papers reach from A star down to E. On the numeric scale the equivalents are broadly grade 5 down to grade 1 for core and grade 9 down to grade 2 for extended.
Can you get an A star on IGCSE core papers?
No. The core tier caps the maximum grade below the top of the scale, so the highest grades such as A star, A or grade 9 are only available through the extended tier.
Should my child take core or extended?
It depends on the subject and the student's confidence with the harder content. Extended keeps the top grades in reach but is more demanding, while core can be the safer route to a secure middle grade. Teachers usually advise per subject based on progress.